[PATCH] iommu: disable on !MMU builds
Arnd Bergmann
arnd at arndb.de
Wed Jan 28 06:45:53 PST 2015
A lot of the IOMMU support code does not build if the CPU does
not have an MMU itself, and it's not clear if there is any
use case for it, so let's just disable it and wait for anybody
to need it.
This avoids randconfig errors like
../arch/arm/mm/dma-mapping.c: In function '__iommu_alloc_remap':
../arch/arm/mm/dma-mapping.c:1278:34: error: 'VM_ARM_DMA_CONSISTENT' undeclared (first use in this function)
area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP,
^
../arch/arm/mm/dma-mapping.c:1278:34: note: each undeclared identifier is reported only once for each function it appears in
../arch/arm/mm/dma-mapping.c: In function '__atomic_get_pages':
../arch/arm/mm/dma-mapping.c:1358:27: error: 'atomic_pool' undeclared (first use in this function)
struct dma_pool *pool = &atomic_pool;
Signed-off-by: Arnd Bergmann <arnd at arndb.de>
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index c68c8db0e6f7..089da97d7c6b 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -4,6 +4,7 @@ config IOMMU_API
menuconfig IOMMU_SUPPORT
bool "IOMMU Hardware Support"
+ depends on MMU
default y
---help---
Say Y here if you want to compile device drivers for IO Memory
@@ -170,7 +171,7 @@ config IRQ_REMAP
# OMAP IOMMU support
config OMAP_IOMMU
bool "OMAP IOMMU Support"
- depends on ARCH_OMAP2PLUS
+ depends on ARCH_OMAP2PLUS && MMU
select IOMMU_API
config OMAP_IOMMU_DEBUG
@@ -217,7 +218,7 @@ config TEGRA_IOMMU_SMMU
config EXYNOS_IOMMU
bool "Exynos IOMMU Support"
- depends on ARCH_EXYNOS && ARM
+ depends on ARCH_EXYNOS && ARM && MMU
select IOMMU_API
select ARM_DMA_USE_IOMMU
help
@@ -246,7 +247,7 @@ config SHMOBILE_IPMMU_TLB
config SHMOBILE_IOMMU
bool "IOMMU for Renesas IPMMU/IPMMUI"
default n
- depends on ARM
+ depends on ARM && MMU
depends on ARCH_SHMOBILE || COMPILE_TEST
select IOMMU_API
select ARM_DMA_USE_IOMMU
@@ -336,6 +337,7 @@ config SPAPR_TCE_IOMMU
config ARM_SMMU
bool "ARM Ltd. System MMU (SMMU) Support"
depends on ARM64 || ARM
+ depends on MMU
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
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